98659a339d
This removes special-casing of boxes from `rustc_pattern_analysis`, as a first step in replacing `box_patterns` with `deref_patterns`. Incidentally, it fixes a bug caused by box patterns being represented as structs rather than pointers, where `exhaustive_patterns` could generate spurious `unreachable_patterns` lints on arms required for exhaustiveness; following the lint's advice would result in an error.
45 lines
1.6 KiB
Text
45 lines
1.6 KiB
Text
error[E0004]: non-exhaustive patterns: `Ok(_)` not covered
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--> $DIR/uninhabited-patterns.rs:34:11
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LL | match x {
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| ^ pattern `Ok(_)` not covered
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note: `Result<Box<NotSoSecretlyEmpty>, &[Result<!, !>]>` defined here
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--> $SRC_DIR/core/src/result.rs:LL:COL
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::: $SRC_DIR/core/src/result.rs:LL:COL
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= note: not covered
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= note: the matched value is of type `Result<Box<NotSoSecretlyEmpty>, &[Result<!, !>]>`
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help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
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LL ~ Err(&[..]) => (),
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LL ~ Ok(_) => todo!(),
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error: unreachable pattern
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--> $DIR/uninhabited-patterns.rs:43:9
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LL | Err(Ok(_y)) => (),
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| ^^^^^^^^^^^-------
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| |
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| matches no values because `NotSoSecretlyEmpty` is uninhabited
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| help: remove the match arm
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= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
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note: the lint level is defined here
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--> $DIR/uninhabited-patterns.rs:4:9
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LL | #![deny(unreachable_patterns)]
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| ^^^^^^^^^^^^^^^^^^^^
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error: unreachable pattern
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--> $DIR/uninhabited-patterns.rs:46:15
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LL | while let Some(_y) = foo() {
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| ^^^^^^^^ matches no values because `NotSoSecretlyEmpty` is uninhabited
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= note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
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error: aborting due to 3 previous errors
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For more information about this error, try `rustc --explain E0004`.
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